Spinal anesthesia is widely accepted as the anesthetic method of choice for Cesarean section. However, the incidence of spinal hypotension is 50-70%, and the decrease in blood pressure is often rapid and severe. Heart rate variability is influenced by various factors such as the sympathetic nervous system, parasympathetic nervous system, temperature regulation, baroreflex, and endocrine regulation, but high frequency heart rate variability above 0.15 Hz very specifically reflects the parasympathetic nervous system. The ANI monitor calculates heart rate variability mediated by changes in the parasympathetic nervous system. This study aims to determine whether ANI monitor can predict hypotension in patients undergoing a caesarean section under spinal anaesthesia while applying the preemptive vasopressor phenylephrine infusion protocol.
Study Type
OBSERVATIONAL
Enrollment
40
The ANI monitor calculates heart rate variability mediated by changes in the parasympathetic nervous system.
Yonsei University Health system, Severance Hospital
Seoul, South Korea
RECRUITINGpredictive value of ANI monitor for spinal hypotension during cesarean delivery
Investigators will determine the predictive power of the ANI score change for the occurrence of hypotension after spinal anesthesia by drawing a receiver operating characteristic (ROC) curve of the change in ANI score (baseline value - minimum value) and calculating the area under the ROC curve.
Time frame: the occurence of hypotension at (within) 1 hour after spinal anesthesia
Optimal cutoff value of ANI level for predicting occurrence of hypotension
Investigators will determine the optimal cutoff value of ANI level for predicting hypotension after spinal anesthesia.
Time frame: the occurence of hypotension at (within) 1 hour after spinal anesthesia
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